when I use the a/c the engine revs were not increasing on tick over, I put a volt meter on the air filter Supplementary air valve in the r.h. air cleaner and when the a/c was put on there was a 1 second live feed to the s.a.v. and then zero
so I disconnected it from its twin connections and wired it direct to the compressor live and an earth to the engine, it works fine now, but have I caused another problem by doing this, and were does the factory feed come from, is there a relay that should work but isn't?

 

Nope.

Originally part of the 15 minute timer stuff we all remove.

Not sure of it being used for a/c kick up. but some markets did/do have items and systems I dont know about.

I have mine the same as your for a very long time, no issues at all.

 

There are 3 or 4 iterations of the SAV circuit, some not having any tie-in to the a/c compressor circuit.

My diagram for early USA-market cars show the SAV powered by brown/slate wire from the fuel pump relay and grounded/earthed by a pink/white wire from the 45-second timer...and *in series with* the canister purge valve and solenoid vacuum valve. No tie-in to the a/c circuit.

I 99% certain (at least some) ROW cars used different timers and operating logic so I'm not certain that any info I have would help....or hurt.

The compressor is engaged whenever the climate control is in used, even when heating is called for. Personally, I'd just set the idle speed to my liking with the climate control 'on' and call it good. It's a rare day that I ever turn the climate control off. But that's just me. The downside, of course, is the idle being a bit too high on those rare occasions where the climate control is turned off.

Cheers
DD

 

thanks Grant and Doug that's just what I wanted to know.

 

The SAV solenoid only used about half an amp, Rex, so no bothers with direct wiring. That is what I have done too, but in my case it is triggered by the main electric fan, so I get a bit more revs in traffic hold ups to help the battery.

 

glad I did that now, I was thinking of fitting a relay, but I wont bother now. ta Greg. so I wonder if I fit a diode in the system I could also wire it to the fans? just realised Greg I should have done the fan connection as its the same only better,

 

Hello All. Reviving this old thread with a question...

In my quest to bring my AC back to life, recently, I found this SAV... Electrically unattached, hanging there - two black wire unattached. The GW green and white wire and the BN brown and slate wires going to it from the idle relay? both unattached at dead ends as well, taped over but the P.O. I'm guessing

I have zero voltage to a.c. compressor and near zero voltage to the control side of the a.c. relay. I had been assuming that the climate conteol ECU wasn't sending the signal to the A.C. relay to kick on... Just 1volt comes from the climate control ECU end to the control for the relay... If I manually click on the a.c. compressor relay, I can hear the idle control relay click on as well... Could what I describe above (to do with the miswire of the SAV) be the cause or have anything to do with why I have no right voltage at compressor OR the a.c. control relay?